Added comment

app/src/main/java/eu/faircode/email/Core.java

@@ -541,6 +541,7 @@ class Core {
                             // Add: NO [OVERQUOTA] Not enough disk quota (n.nnn + n.nnn + n.nnn secs).
                             // Add: NO [OVERQUOTA] Quota exceeded (mailbox for user is full) (n.nnn + n.nnn secs).
                             // Add: NO APPEND failed
+                            // Add: BAD [TOOBIG] Message too large.
                             // Delete: NO [CANNOT] STORE It's not possible to perform specified operation
                             // Delete: NO [UNAVAILABLE] EXPUNGE Backend error
                             // Delete: NO mailbox selected READ-ONLY